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Merge "mhi: core: Make sure reg_write_q stores visible to other cores"

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qctecmdr 2020-04-21 20:21:59 -07:00 • committed by Gerrit - the friendly Code Review server
commit bcf1293b7c
1 changed files with 14 additions and 0 deletions
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14
drivers/bus/mhi/core/mhi_main.c
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@ -118,7 +118,21 @@ static void mhi_reg_write_enqueue(struct mhi_controller *mhi_cntrl,
mhi_cntrl->reg_write_q[q_index].reg_addr = reg_addr;
mhi_cntrl->reg_write_q[q_index].val = val;
/*
* prevent reordering to make sure val is set before valid is set to
* true. This prevents offload worker running on another core to write
* stale value to register with valid set to true.
*/
smp_wmb();
mhi_cntrl->reg_write_q[q_index].valid = true;
/*
* make sure valid value is visible to other cores to prevent offload
* worker from skipping the reg write.
*/
smp_wmb();
}
void mhi_write_reg_offload(struct mhi_controller *mhi_cntrl,