diff mbox series

[v3,4/8] crypto: scomp - Disable BH when taking per-cpu spin lock

Message ID a828ace6ce7af8eb17819b9ca93d8a6dcec4ef4a.1741488107.git.herbert@gondor.apana.org.au
State New
Headers show
Series crypto: acomp - Add request chaining and virtual address support | expand

Commit Message

Herbert Xu March 9, 2025, 2:43 a.m. UTC 
Disable BH when taking per-cpu spin locks.  This isn't an issue
right now because the only user zswap calls scomp from process
context.  However, if scomp is called from softirq context the
spin lock may dead-lock.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
 crypto/scompress.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/crypto/scompress.c b/crypto/scompress.c
index 9b6d9bbbc73a..a2ce481a10bb 100644
--- a/crypto/scompress.c
+++ b/crypto/scompress.c
@@ -182,7 +182,7 @@  static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
 	dlen = req->dlen;
 
 	scratch = raw_cpu_ptr(&scomp_scratch);
-	spin_lock(&scratch->lock);
+	spin_lock_bh(&scratch->lock);
 
 	if (sg_nents(req->src) == 1 && !PageHighMem(sg_page(req->src))) {
 		src = page_to_virt(sg_page(req->src)) + req->src->offset;
@@ -230,7 +230,7 @@  static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
 		}
 	}
 out:
-	spin_unlock(&scratch->lock);
+	spin_unlock_bh(&scratch->lock);
 	return ret;
 }