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staging: fsl-mc/dpio: Fix incorrect comparison

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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 <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ioana Radulescu 2017-09-28 09:10:33 -05:00 committed by Greg Kroah-Hartman
parent abd4b78793
commit 8dabf52ffb
2 changed files with 6 additions and 4 deletions
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4
drivers/staging/fsl-mc/bus/dpio/dpio-service.c
View File

@ -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;
}

6
drivers/staging/fsl-mc/include/dpaa2-io.h
View File

@ -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