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Tue, 15 Oct 2024 10:56:14 +0000 (GMT) From: Vishal Chourasia To: linuxppc-dev@lists.ozlabs.org, herbert@gondor.apana.org.au, davem@davemloft.net, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, naveen@kernel.org, maddy@linux.ibm.com, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Vishal Chourasia Subject: [v2 PATCH 1/2] crypto/nx: Rename devdata_mutex to devdata_spinlock Date: Tue, 15 Oct 2024 16:25:51 +0530 Message-ID: <20241015105551.1817348-2-vishalc@linux.ibm.com> X-Mailer: git-send-email 2.47.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: HKfRnHAqL1xiFkXwLc3bSU4HDEzsYXU- X-Proofpoint-ORIG-GUID: nU97NAV6X78iUj4JyH_ltF9gpyi0-IwX X-Proofpoint-UnRewURL: 0 URL was un-rewritten Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 clxscore=1015 mlxscore=0 malwarescore=0 adultscore=0 impostorscore=0 phishscore=0 mlxlogscore=928 spamscore=0 lowpriorityscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410150072 Rename devdata_mutex to devdata_spinlock to accurately reflect its implementation as a spinlock. [1] v1 https://lore.kernel.org/all/ZwyqD-w5hEhrnqTB@linux.ibm.com Signed-off-by: Vishal Chourasia --- drivers/crypto/nx/nx-common-pseries.c | 34 +++++++++++++-------------- 1 file changed, 17 insertions(+), 17 deletions(-) diff --git a/drivers/crypto/nx/nx-common-pseries.c b/drivers/crypto/nx/nx-common-pseries.c index 35f2d0d8507ed..a0eb900383af7 100644 --- a/drivers/crypto/nx/nx-common-pseries.c +++ b/drivers/crypto/nx/nx-common-pseries.c @@ -133,7 +133,7 @@ struct nx842_devdata { }; static struct nx842_devdata __rcu *devdata; -static DEFINE_SPINLOCK(devdata_mutex); +static DEFINE_SPINLOCK(devdata_spinlock); #define NX842_COUNTER_INC(_x) \ static inline void nx842_inc_##_x( \ @@ -750,15 +750,15 @@ static int nx842_OF_upd(struct property *new_prop) if (!new_devdata) return -ENOMEM; - spin_lock_irqsave(&devdata_mutex, flags); + spin_lock_irqsave(&devdata_spinlock, flags); old_devdata = rcu_dereference_check(devdata, - lockdep_is_held(&devdata_mutex)); + lockdep_is_held(&devdata_spinlock)); if (old_devdata) of_node = old_devdata->dev->of_node; if (!old_devdata || !of_node) { pr_err("%s: device is not available\n", __func__); - spin_unlock_irqrestore(&devdata_mutex, flags); + spin_unlock_irqrestore(&devdata_spinlock, flags); kfree(new_devdata); return -ENODEV; } @@ -810,7 +810,7 @@ static int nx842_OF_upd(struct property *new_prop) old_devdata->max_sg_len); rcu_assign_pointer(devdata, new_devdata); - spin_unlock_irqrestore(&devdata_mutex, flags); + spin_unlock_irqrestore(&devdata_spinlock, flags); synchronize_rcu(); dev_set_drvdata(new_devdata->dev, new_devdata); kfree(old_devdata); @@ -821,13 +821,13 @@ static int nx842_OF_upd(struct property *new_prop) dev_info(old_devdata->dev, "%s: device disabled\n", __func__); nx842_OF_set_defaults(new_devdata); rcu_assign_pointer(devdata, new_devdata); - spin_unlock_irqrestore(&devdata_mutex, flags); + spin_unlock_irqrestore(&devdata_spinlock, flags); synchronize_rcu(); dev_set_drvdata(new_devdata->dev, new_devdata); kfree(old_devdata); } else { dev_err(old_devdata->dev, "%s: could not update driver from hardware\n", __func__); - spin_unlock_irqrestore(&devdata_mutex, flags); + spin_unlock_irqrestore(&devdata_spinlock, flags); } if (!ret) @@ -1045,9 +1045,9 @@ static int nx842_probe(struct vio_dev *viodev, return -ENOMEM; } - spin_lock_irqsave(&devdata_mutex, flags); + spin_lock_irqsave(&devdata_spinlock, flags); old_devdata = rcu_dereference_check(devdata, - lockdep_is_held(&devdata_mutex)); + lockdep_is_held(&devdata_spinlock)); if (old_devdata && old_devdata->vdev != NULL) { dev_err(&viodev->dev, "%s: Attempt to register more than one instance of the hardware\n", __func__); @@ -1062,7 +1062,7 @@ static int nx842_probe(struct vio_dev *viodev, nx842_OF_set_defaults(new_devdata); rcu_assign_pointer(devdata, new_devdata); - spin_unlock_irqrestore(&devdata_mutex, flags); + spin_unlock_irqrestore(&devdata_spinlock, flags); synchronize_rcu(); kfree(old_devdata); @@ -1101,7 +1101,7 @@ static int nx842_probe(struct vio_dev *viodev, return 0; error_unlock: - spin_unlock_irqrestore(&devdata_mutex, flags); + spin_unlock_irqrestore(&devdata_spinlock, flags); if (new_devdata) kfree(new_devdata->counters); kfree(new_devdata); @@ -1122,12 +1122,12 @@ static void nx842_remove(struct vio_dev *viodev) crypto_unregister_alg(&nx842_pseries_alg); - spin_lock_irqsave(&devdata_mutex, flags); + spin_lock_irqsave(&devdata_spinlock, flags); old_devdata = rcu_dereference_check(devdata, - lockdep_is_held(&devdata_mutex)); + lockdep_is_held(&devdata_spinlock)); of_reconfig_notifier_unregister(&nx842_of_nb); RCU_INIT_POINTER(devdata, NULL); - spin_unlock_irqrestore(&devdata_mutex, flags); + spin_unlock_irqrestore(&devdata_spinlock, flags); synchronize_rcu(); dev_set_drvdata(&viodev->dev, NULL); if (old_devdata) @@ -1257,11 +1257,11 @@ static void __exit nx842_pseries_exit(void) crypto_unregister_alg(&nx842_pseries_alg); - spin_lock_irqsave(&devdata_mutex, flags); + spin_lock_irqsave(&devdata_spinlock, flags); old_devdata = rcu_dereference_check(devdata, - lockdep_is_held(&devdata_mutex)); + lockdep_is_held(&devdata_spinlock)); RCU_INIT_POINTER(devdata, NULL); - spin_unlock_irqrestore(&devdata_mutex, flags); + spin_unlock_irqrestore(&devdata_spinlock, flags); synchronize_rcu(); if (old_devdata && old_devdata->dev) dev_set_drvdata(old_devdata->dev, NULL); From patchwork Tue Oct 15 10:55:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vishal Chourasia X-Patchwork-Id: 835928 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E94361EBA19; Tue, 15 Oct 2024 10:56:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728989802; cv=none; b=bLF6POwsLJ4B8IcYOkoWX1jn5RzQJv8yjRLNIpfa3dfqF1PKhKpVdhWL+7+8C04H+VHa+dhhrmBN+eHDlFSwEgOyjQ8i1dBDHvwqK2Ah/dEojYuEUcrpRh+9Xz0Gg6dFTzVSKEq9usXnZ32LuZkTO3akU5uEelYUnUR1YoCLgE8= ARC-Message-Signature: i=1; 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Tue, 15 Oct 2024 10:56:17 +0000 (GMT) From: Vishal Chourasia To: linuxppc-dev@lists.ozlabs.org, herbert@gondor.apana.org.au, davem@davemloft.net, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, naveen@kernel.org, maddy@linux.ibm.com, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Vishal Chourasia Subject: [v2 PATCH 2/2] crypto/nx: Fix invalid wait context during kexec reboot Date: Tue, 15 Oct 2024 16:25:52 +0530 Message-ID: <20241015105551.1817348-3-vishalc@linux.ibm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241015105551.1817348-2-vishalc@linux.ibm.com> References: <20241015105551.1817348-2-vishalc@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: g16Py42SK_L-rMj-yeOvDFUupNO8oXmW X-Proofpoint-ORIG-GUID: fs1dDhFKwsuTRqwwm_EFPCJBgdaU9WZJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 mlxscore=0 suspectscore=0 phishscore=0 adultscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 malwarescore=0 mlxlogscore=791 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410150072 nx842_remove() call of_reconfig_notifier_unregister while holding the devdata_spinlock. This could lead to an invalid wait context error during kexec reboot, as of_reconfig_notifier_unregister tries to acquire a read-write semaphore (check logs) while holding a spinlock. Move the of_reconfig_notifier_unregister() call before acquiring the spinlock to prevent this race condition invalid wait contexts during system shutdown or kexec operations. Log: [ BUG: Invalid wait context ] 6.11.0-test2-10547-g684a64bf32b6-dirty #79 Not tainted ----------------------------- kexec/61926 is trying to lock: c000000002d8b590 ((of_reconfig_chain).rwsem){++++}-{4:4}, at: blocking_notifier_chain_unregister+0x44/0xa0 other info that might help us debug this: context-{5:5} 4 locks held by kexec/61926: #0: c000000002926c70 (system_transition_mutex){+.+.}-{4:4}, at: __do_sys_reboot+0xf8/0x2e0 #1: c00000000291af30 (&dev->mutex){....}-{4:4}, at: device_shutdown+0x160/0x310 #2: c000000051011938 (&dev->mutex){....}-{4:4}, at: device_shutdown+0x174/0x310 #3: c000000002d88070 (devdata_mutex){....}-{3:3}, at: nx842_remove+0xac/0x1bc stack backtrace: CPU: 2 UID: 0 PID: 61926 Comm: kexec Not tainted 6.11.0-test2-10547-g684a64bf32b6-dirty #79 Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_012) hv:phyp pSeries Call Trace: [c0000000bb577400] [c000000001239704] dump_stack_lvl+0xc8/0x130 (unreliable) [c0000000bb577440] [c000000000248398] __lock_acquire+0xb68/0xf00 [c0000000bb577550] [c000000000248820] lock_acquire.part.0+0xf0/0x2a0 [c0000000bb577670] [c00000000127faa0] down_write+0x70/0x1e0 [c0000000bb5776b0] [c0000000001acea4] blocking_notifier_chain_unregister+0x44/0xa0 [c0000000bb5776e0] [c000000000e2312c] of_reconfig_notifier_unregister+0x2c/0x40 [c0000000bb577700] [c000000000ded24c] nx842_remove+0x148/0x1bc [c0000000bb577790] [c00000000011a114] vio_bus_remove+0x54/0xc0 [c0000000bb5777c0] [c000000000c1a44c] device_shutdown+0x20c/0x310 [c0000000bb577850] [c0000000001b0ab4] kernel_restart_prepare+0x54/0x70 [c0000000bb577870] [c000000000308718] kernel_kexec+0xa8/0x110 [c0000000bb5778e0] [c0000000001b1144] __do_sys_reboot+0x214/0x2e0 [c0000000bb577a40] [c000000000032f98] system_call_exception+0x148/0x310 [c0000000bb577e50] [c00000000000cedc] system_call_vectored_common+0x15c/0x2ec --- interrupt: 3000 at 0x7fffa07e7df8 NIP: 00007fffa07e7df8 LR: 00007fffa07e7df8 CTR: 0000000000000000 REGS: c0000000bb577e80 TRAP: 3000 Not tainted (6.11.0-test2-10547-g684a64bf32b6-dirty) MSR: 800000000280f033 CR: 48022484 XER: 00000000 IRQMASK: 0 GPR00: 0000000000000058 00007ffff961f1e0 00007fffa08f7100 fffffffffee1dead GPR04: 0000000028121969 0000000045584543 0000000000000000 0000000000000003 GPR08: 0000000000000003 0000000000000000 0000000000000000 0000000000000000 GPR12: 0000000000000000 00007fffa0a9b360 ffffffffffffffff 0000000000000000 GPR16: 0000000000000001 0000000000000002 0000000000000001 0000000000000001 GPR20: 000000011710f520 0000000000000000 0000000000000000 0000000000000001 GPR24: 0000000129be0480 0000000000000003 0000000000000003 00007ffff961f2b0 GPR28: 00000001170f2d30 00000001170f2d28 00007fffa08f18d0 0000000129be04a0 NIP [00007fffa07e7df8] 0x7fffa07e7df8 LR [00007fffa07e7df8] 0x7fffa07e7df8 --- interrupt: 3000 Suggested-by: Michael Ellerman Signed-off-by: Vishal Chourasia --- drivers/crypto/nx/nx-common-pseries.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/crypto/nx/nx-common-pseries.c b/drivers/crypto/nx/nx-common-pseries.c index a0eb900383af7..1660c5cf3641c 100644 --- a/drivers/crypto/nx/nx-common-pseries.c +++ b/drivers/crypto/nx/nx-common-pseries.c @@ -1122,10 +1122,11 @@ static void nx842_remove(struct vio_dev *viodev) crypto_unregister_alg(&nx842_pseries_alg); + of_reconfig_notifier_unregister(&nx842_of_nb); + spin_lock_irqsave(&devdata_spinlock, flags); old_devdata = rcu_dereference_check(devdata, lockdep_is_held(&devdata_spinlock)); - of_reconfig_notifier_unregister(&nx842_of_nb); RCU_INIT_POINTER(devdata, NULL); spin_unlock_irqrestore(&devdata_spinlock, flags); synchronize_rcu();