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Merge "msm: mhi_dev: Ensure the flush list is empty for a stopped channel"

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qctecmdr 2021-09-19 23:38:34 -07:00 • committed by Gerrit - the friendly Code Review server
commit 86bc9bf101
1 changed files with 16 additions and 0 deletions
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16
drivers/platform/msm/mhi_dev/mhi.c
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@ -1841,6 +1841,8 @@ static void mhi_dev_process_reset_cmd(struct mhi_dev *mhi, int ch_id)
int rc = 0;
struct mhi_dev_channel *ch;
struct mhi_addr host_addr;
struct event_req *itr, *tmp;
unsigned long flags;
rc = mhi_dev_mmio_disable_chdb_a7(mhi, ch_id);
if (rc) {
@ -1855,6 +1857,20 @@ static void mhi_dev_process_reset_cmd(struct mhi_dev *mhi, int ch_id)
}
ch = &mhi->ch[ch_id];
mhi_log(MHI_MSG_VERBOSE, "Processing reset cmd for ch%d\n", ch_id);
/*
* Ensure that the completions that are present in the flush list are
* removed from the list and discarded before stopping the channel.
* Otherwise, those stale events may get flushed along with a valid
* event in the next flush operation.
*/
spin_lock_irqsave(&mhi_ctx->lock, flags);
list_for_each_entry_safe(itr, tmp, &ch->flush_event_req_buffers, list) {
list_del(&itr->list);
kfree(itr);
}
spin_unlock_irqrestore(&mhi_ctx->lock, flags);
/* hard stop and set the channel to stop */
mhi->ch_ctx_cache[ch_id].ch_state =
MHI_DEV_CH_STATE_DISABLED;