diff mbox series

[v3,1/8] mailbox: mpfs: fix an incorrect mask width

Message ID 20230307202257.1762151-2-conor@kernel.org (mailing list archive)
State Accepted
Delegated to: Conor Dooley
Headers show
Series Hey Jassi, all, | expand

Checks

Context Check Description
conchuod/cover_letter success Series has a cover letter
conchuod/tree_selection success Guessed tree name to be fixes
conchuod/fixes_present success Fixes tag present in non-next series
conchuod/maintainers_pattern success MAINTAINERS pattern errors before the patch: 1 and now 1
conchuod/verify_signedoff success Signed-off-by tag matches author and committer
conchuod/kdoc success Errors and warnings before: 0 this patch: 0
conchuod/build_rv64_clang_allmodconfig success Errors and warnings before: 18 this patch: 18
conchuod/module_param success Was 0 now: 0
conchuod/build_rv64_gcc_allmodconfig success Errors and warnings before: 18 this patch: 18
conchuod/alphanumeric_selects success Out of order selects before the patch: 728 and now 728
conchuod/build_rv32_defconfig success Build OK
conchuod/dtb_warn_rv64 success Errors and warnings before: 3 this patch: 3
conchuod/header_inline success No static functions without inline keyword in header files
conchuod/checkpatch success total: 0 errors, 0 warnings, 0 checks, 15 lines checked
conchuod/source_inline success Was 0 now: 0
conchuod/build_rv64_nommu_k210_defconfig success Build OK
conchuod/verify_fixes success No Fixes tag
conchuod/build_rv64_nommu_virt_defconfig success Build OK

Commit Message

Conor Dooley March 7, 2023, 8:22 p.m. UTC 
From: Conor Dooley <conor.dooley@microchip.com>

The system controller registers on PolarFire SoC are 32 bits wide, so
16 + 16 as the first input to GENMASK_ULL() gives a 33 bit wide mask.
It probably should have been immediately obvious when it was pointed
out during review that the width required using GENMASK_ULL() - but I
scarcely knew what I was doing at the time and missed it.
The mistake ends up being moot as it is a mask after all, but it is
incorrect and should be fixed.

No functional change intended.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
 drivers/mailbox/mailbox-mpfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/mailbox/mailbox-mpfs.c b/drivers/mailbox/mailbox-mpfs.c
index 853901acaeec..d37560e91116 100644
--- a/drivers/mailbox/mailbox-mpfs.c
+++ b/drivers/mailbox/mailbox-mpfs.c
@@ -39,7 +39,7 @@ 
 #define SCB_CTRL_NOTIFY_MASK BIT(SCB_CTRL_NOTIFY)
 
 #define SCB_CTRL_POS (16)
-#define SCB_CTRL_MASK GENMASK_ULL(SCB_CTRL_POS + SCB_MASK_WIDTH, SCB_CTRL_POS)
+#define SCB_CTRL_MASK GENMASK(SCB_CTRL_POS + SCB_MASK_WIDTH - 1, SCB_CTRL_POS)
 
 /* SCBCTRL service status register */
 
@@ -118,6 +118,7 @@  static int mpfs_mbox_send_data(struct mbox_chan *chan, void *data)
 	}
 
 	opt_sel = ((msg->mbox_offset << 7u) | (msg->cmd_opcode & 0x7fu));
+
 	tx_trigger = (opt_sel << SCB_CTRL_POS) & SCB_CTRL_MASK;
 	tx_trigger |= SCB_CTRL_REQ_MASK | SCB_STATUS_NOTIFY_MASK;
 	writel_relaxed(tx_trigger, mbox->ctrl_base + SERVICES_CR_OFFSET);