6.6-stable review patch. If anyone has any objections, please let me know.
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From: Sudeep Holla sudeep.holla@arm.com
[ Upstream commit 3a675f50415b95f2ae10bfd932e2154ba1a08ee7 ]
The existing error handling logic in pcc_mbox_irq() is intermixed with the main flow of the function. The command complete check and the complete complete update/acknowledgment are nicely factored into separate functions.
Moves error detection and clearing logic into a separate function called: pcc_mbox_error_check_and_clear() by extracting error-handling logic from pcc_mbox_irq().
This ensures error checking and clearing are handled separately and it improves maintainability by keeping the IRQ handler focused on processing events.
Acked-by: Huisong Li lihuisong@huawei.com Tested-by: Huisong Li lihuisong@huawei.com Tested-by: Adam Young admiyo@os.amperecomputing.com Signed-off-by: Sudeep Holla sudeep.holla@arm.com Signed-off-by: Jassi Brar jassisinghbrar@gmail.com Stable-dep-of: ff0e4d4c97c9 ("mailbox: pcc: don't zero error register") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mailbox/pcc.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c index 49254d99a8ad6..bb977cf8ad423 100644 --- a/drivers/mailbox/pcc.c +++ b/drivers/mailbox/pcc.c @@ -269,6 +269,25 @@ static bool pcc_mbox_cmd_complete_check(struct pcc_chan_info *pchan) return !!val; }
+static int pcc_mbox_error_check_and_clear(struct pcc_chan_info *pchan) +{ + u64 val; + int ret; + + ret = pcc_chan_reg_read(&pchan->error, &val); + if (ret) + return ret; + + val &= pchan->error.status_mask; + if (val) { + val &= ~pchan->error.status_mask; + pcc_chan_reg_write(&pchan->error, val); + return -EIO; + } + + return 0; +} + static void check_and_ack(struct pcc_chan_info *pchan, struct mbox_chan *chan) { struct acpi_pcct_ext_pcc_shared_memory pcc_hdr; @@ -309,8 +328,6 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p) { struct pcc_chan_info *pchan; struct mbox_chan *chan = p; - u64 val; - int ret;
pchan = chan->con_priv;
@@ -324,15 +341,8 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p) if (!pcc_mbox_cmd_complete_check(pchan)) return IRQ_NONE;
- ret = pcc_chan_reg_read(&pchan->error, &val); - if (ret) + if (pcc_mbox_error_check_and_clear(pchan)) return IRQ_NONE; - val &= pchan->error.status_mask; - if (val) { - val &= ~pchan->error.status_mask; - pcc_chan_reg_write(&pchan->error, val); - return IRQ_NONE; - }
/* * Clear this flag after updating interrupt ack register and just