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SubjectApplied "spi: cadence: Change usleep_range() to udelay(), for atomic context" to the spi tree
Date
The patch

spi: cadence: Change usleep_range() to udelay(), for atomic context

has been applied to the spi tree at

https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 931c4e9a72ae91d59c5332ffb6812911a749da8e Mon Sep 17 00:00:00 2001
From: Janek Kotas <jank@cadence.com>
Date: Mon, 4 Jun 2018 11:24:44 +0000
Subject: [PATCH] spi: cadence: Change usleep_range() to udelay(), for atomic
context

The path "spi: cadence: Add usleep_range() for
cdns_spi_fill_tx_fifo()" added a usleep_range() function call,
which cannot be used in atomic context.
However the cdns_spi_fill_tx_fifo() function can be called during
an interrupt which may result in a kernel panic:

BUG: scheduling while atomic: grep/561/0x00010002
Modules linked in:
Preemption disabled at:
[<ffffff800858ea28>] wait_for_common+0x48/0x178
CPU: 0 PID: 561 Comm: grep Not tainted 4.17.0 #1
Hardware name: Cadence CSP (DT)
Call trace:
dump_backtrace+0x0/0x198
show_stack+0x14/0x20
dump_stack+0x8c/0xac
__schedule_bug+0x6c/0xb8
__schedule+0x570/0x5d8
schedule+0x34/0x98
schedule_hrtimeout_range_clock+0x98/0x110
schedule_hrtimeout_range+0x10/0x18
usleep_range+0x64/0x98
cdns_spi_fill_tx_fifo+0x70/0xb0
cdns_spi_irq+0xd0/0xe0
__handle_irq_event_percpu+0x9c/0x128
handle_irq_event_percpu+0x34/0x88
handle_irq_event+0x48/0x78
handle_fasteoi_irq+0xbc/0x1b0
generic_handle_irq+0x24/0x38
__handle_domain_irq+0x84/0xf8
gic_handle_irq+0xc4/0x180

This patch replaces the function call with udelay() which can be
used in an atomic context, like an interrupt.

Signed-off-by: Jan Kotas <jank@cadence.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
---
drivers/spi/spi-cadence.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c
index f3dad6fcdc35..a568f35522f9 100644
--- a/drivers/spi/spi-cadence.c
+++ b/drivers/spi/spi-cadence.c
@@ -319,7 +319,7 @@ static void cdns_spi_fill_tx_fifo(struct cdns_spi *xspi)
*/
if (cdns_spi_read(xspi, CDNS_SPI_ISR) &
CDNS_SPI_IXR_TXFULL)
- usleep_range(10, 20);
+ udelay(10);

if (xspi->txbuf)
cdns_spi_write(xspi, CDNS_SPI_TXD, *xspi->txbuf++);
--
2.17.1
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