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[80.11.198.90]) by smtp.gmail.com with ESMTPSA id e198sm14267576wmd.0.2016.01.07.07.50.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 07 Jan 2016 07:50:30 -0800 (PST) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, david@gibson.dropbear.id.au, alex.williamson@redhat.com Cc: alex.bennee@linaro.org, thuth@redhat.com, crosthwaitepeter@gmail.com, patches@linaro.org, christoffer.dall@linaro.org, pbonzini@redhat.com, b.reynal@virtualopensystems.com, suravee.suthikulpanit@amd.com, thomas.lendacky@amd.com Subject: [PATCH v3 4/8] device_tree: qemu_fdt_getprop converted to use the error API Date: Thu, 7 Jan 2016 15:50:11 +0000 Message-Id: <1452181815-1948-5-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1452181815-1948-1-git-send-email-eric.auger@linaro.org> References: <1452181815-1948-1-git-send-email-eric.auger@linaro.org> Current qemu_fdt_getprop exits if the property is not found. It is sometimes needed to read an optional property, in which case we do not wish to exit but simply returns a null value. This patch converts qemu_fdt_getprop to accept an Error **, and existing users are converted to pass &error_fatal. This preserves the existing behaviour. Then to use the API with your optional semantic a null parameter can be conveyed. Signed-off-by: Eric Auger --- v1 -> v2: - add a doc comment in the header file RFC -> v1: - get rid of qemu_fdt_getprop_optional and implement Peter's suggestion that consists in using the error API Signed-off-by: Eric Auger --- device_tree.c | 11 ++++++----- include/sysemu/device_tree.h | 15 ++++++++++++++- 2 files changed, 20 insertions(+), 6 deletions(-) -- 1.9.1 diff --git a/device_tree.c b/device_tree.c index 8441e01..6ecc9da 100644 --- a/device_tree.c +++ b/device_tree.c @@ -321,18 +321,18 @@ int qemu_fdt_setprop_string(void *fdt, const char *node_path, } const void *qemu_fdt_getprop(void *fdt, const char *node_path, - const char *property, int *lenp) + const char *property, int *lenp, Error **errp) { int len; const void *r; + if (!lenp) { lenp = &len; } r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp); if (!r) { - error_report("%s: Couldn't get %s/%s: %s", __func__, - node_path, property, fdt_strerror(*lenp)); - exit(1); + error_setg(errp, "%s: Couldn't get %s/%s: %s", __func__, + node_path, property, fdt_strerror(*lenp)); } return r; } @@ -341,7 +341,8 @@ uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path, const char *property) { int len; - const uint32_t *p = qemu_fdt_getprop(fdt, node_path, property, &len); + const uint32_t *p = qemu_fdt_getprop(fdt, node_path, property, &len, + &error_fatal); if (len != 4) { error_report("%s: %s/%s not 4 bytes long (not a cell?)", __func__, node_path, property); diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h index 269cb1c..4d7cbb9 100644 --- a/include/sysemu/device_tree.h +++ b/include/sysemu/device_tree.h @@ -45,8 +45,21 @@ int qemu_fdt_setprop_string(void *fdt, const char *node_path, int qemu_fdt_setprop_phandle(void *fdt, const char *node_path, const char *property, const char *target_node_path); +/** + * qemu_fdt_getprop: retrieve the value of a given property + * @fdt: pointer to the device tree blob + * @node_path: node path + * @property: name of the property to find + * @lenp: fdt error if any or length of the property on success + * @errp: handle to an error object + * + * returns a pointer to the property on success and NULL on failure + * in case errp is set to &error_fatal, the function auto-asserts + * on error (legacy behavior) + */ const void *qemu_fdt_getprop(void *fdt, const char *node_path, - const char *property, int *lenp); + const char *property, int *lenp, + Error **errp); uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path, const char *property); uint32_t qemu_fdt_get_phandle(void *fdt, const char *path);