mmc: core: Fix NULL pointer dereference
mmc_signal_sdio_irq() should only be called when the function
driver registers for IRQ notification. In case, if any host
driver recieves a spurious interrupt and call mmc_signal_sdio_irq(),
ignore waking up uninitialized sdio irq thread.
CRs-Fixed: 472609
Change-Id: I831717fe80918538a18cc1f2300fe7fe2817c70f
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 3b5742e..9eef3a0 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -454,6 +454,12 @@
static inline void mmc_signal_sdio_irq(struct mmc_host *host)
{
+ if (!host->sdio_irqs) {
+ pr_err("%s: SDIO interrupt recieved without function driver claiming an irq\n",
+ mmc_hostname(host));
+ return;
+ }
+
host->ops->enable_sdio_irq(host, 0);
host->sdio_irq_pending = true;
wake_up_process(host->sdio_irq_thread);