From 9093d8bc530402a7d7651be40dd53b0b97a813af Mon Sep 17 00:00:00 2001 From: Ioana Radulescu Date: Thu, 28 Sep 2017 09:10:33 -0500 Subject: [PATCH] staging: fsl-mc/dpio: Fix incorrect comparison [ Upstream commit 8dabf52ffb6445fa5bcc8b6d2ecb615f60d0dd12 ] For some dpio functions, a cpu id parameter value of -1 is valid and means "any". But when trying to validate this param value against an upper limit, in this case num_possible_cpus(), we risk obtaining the wrong result due to an implicit cast. Avoid an incorrect check result by explicitly comparing the cpu id with the "any" value before verifying the upper bound. Signed-off-by: Ioana Radulescu Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/staging/fsl-mc/bus/dpio/dpio-service.c | 4 ++-- drivers/staging/fsl-mc/include/dpaa2-io.h | 6 ++++-- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/staging/fsl-mc/bus/dpio/dpio-service.c b/drivers/staging/fsl-mc/bus/dpio/dpio-service.c index f809682..a609ec8 100644 --- a/drivers/staging/fsl-mc/bus/dpio/dpio-service.c +++ b/drivers/staging/fsl-mc/bus/dpio/dpio-service.c @@ -76,7 +76,7 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d, if (d) return d; - if (unlikely(cpu >= num_possible_cpus())) + if (cpu != DPAA2_IO_ANY_CPU && cpu >= num_possible_cpus()) return NULL; /* @@ -121,7 +121,7 @@ struct dpaa2_io *dpaa2_io_create(const struct dpaa2_io_desc *desc) return NULL; /* check if CPU is out of range (-1 means any cpu) */ - if (desc->cpu >= num_possible_cpus()) { + if (desc->cpu != DPAA2_IO_ANY_CPU && desc->cpu >= num_possible_cpus()) { kfree(obj); return NULL; } diff --git a/drivers/staging/fsl-mc/include/dpaa2-io.h b/drivers/staging/fsl-mc/include/dpaa2-io.h index c564609..afc2d06 100644 --- a/drivers/staging/fsl-mc/include/dpaa2-io.h +++ b/drivers/staging/fsl-mc/include/dpaa2-io.h @@ -54,6 +54,8 @@ struct device; * for dequeue. */ +#define DPAA2_IO_ANY_CPU -1 + /** * struct dpaa2_io_desc - The DPIO descriptor * @receives_notifications: Use notificaton mode. Non-zero if the DPIO @@ -91,8 +93,8 @@ irqreturn_t dpaa2_io_irq(struct dpaa2_io *obj); * @cb: The callback to be invoked when the notification arrives * @is_cdan: Zero for FQDAN, non-zero for CDAN * @id: FQID or channel ID, needed for rearm - * @desired_cpu: The cpu on which the notifications will show up. -1 means - * any CPU. + * @desired_cpu: The cpu on which the notifications will show up. Use + * DPAA2_IO_ANY_CPU if don't care * @dpio_id: The dpio index * @qman64: The 64-bit context value shows up in the FQDAN/CDAN. * @node: The list node -- 2.7.4