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bus/vmbus: handle EOF on IRQ read

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This function is not used by netvsc driver yet.
Still the code should handle case where device driver returns
zero (due to rescind).

Coverity issue: 302871
Fixes: 831dba47bd36 ("bus/vmbus: add Hyper-V virtual bus support")

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
This commit is contained in:
Stephen Hemminger 2018-08-06 11:11:08 -07:00 committed by Thomas Monjalon
parent 5ef90536d7
commit cd3e20a687
1 changed files with 10 additions and 4 deletions

14
drivers/bus/vmbus/linux/vmbus_uio.c

@ -39,11 +39,17 @@ void vmbus_uio_irq_control(struct rte_vmbus_device *dev, int32_t onoff)
int vmbus_uio_irq_read(struct rte_vmbus_device *dev)
{
int32_t count;
int cc;
if (read(dev->intr_handle.fd, &count, sizeof(count)) < 0) {
VMBUS_LOG(ERR, "cannot read to %d:%s",
dev->intr_handle.fd, strerror(errno));
count = -errno;
cc = read(dev->intr_handle.fd, &count, sizeof(count));
if (cc < (int)sizeof(count)) {
if (cc < 0) {
VMBUS_LOG(ERR, "IRQ read failed %s",
strerror(errno));
return -errno;
}
VMBUS_LOG(ERR, "can't read IRQ count");
return -EINVAL;
}
return count;