UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

bus: mhi: core: Prevent sending multiple RDDM entry callbacks 

If an mhi_power_down() is initiated after the device has entered
RDDM and a status callback was provided for it, it is possible
that another BHI interrupt fires while waiting for the MHI
RESET to be cleared. If that happens, MHI host would have moved
a "disabled" execution environment and the check to allow sending
an RDDM status callback will pass when it is should not. Add a
check to see if MHI is in an active state before proceeding.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Bhaumik Bhatt 2020-11-09 12:47:24 -08:00 committed by Manivannan Sadhasivam
parent 3fb81a4d5f
commit 0c76b3fa58
No known key found for this signature in database
GPG Key ID: 559F11E6FE91CEF5
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/bus/mhi/core/main.c
View File

@ -401,6 +401,10 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv)
/* If device supports RDDM don't bother processing SYS error */
if (mhi_cntrl->rddm_image) {
/* host may be performing a device power down already */
if (!mhi_is_active(mhi_cntrl))
goto exit_intvec;
if (mhi_cntrl->ee == MHI_EE_RDDM && mhi_cntrl->ee != ee) {
mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_EE_RDDM);
wake_up_all(&mhi_cntrl->state_event);