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spi: Fixes for v6.7

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A couple of fixes that came in during the merge window, one Kconfig
 dependency fix and another fix for a long standing issue where in the
 case where a sync transfer races with system suspend.
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Merge tag 'spi-fix-v6.7-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown:
 "A couple of fixes that came in during the merge window: one Kconfig
  dependency fix and another fix for a long standing issue where a sync
  transfer races with system suspend"

* tag 'spi-fix-v6.7-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: Fix null dereference on suspend
  spi: spi-zynq-qspi: add spi-mem to driver kconfig dependencies
This commit is contained in:
Linus Torvalds 2023-11-10 11:44:38 -08:00
commit ae4f52a729
3 changed files with 41 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/spi/Kconfig
View File

@ -1169,6 +1169,7 @@ config SPI_XTENSA_XTFPGA
config SPI_ZYNQ_QSPI
tristate "Xilinx Zynq QSPI controller"
depends on ARCH_ZYNQ || COMPILE_TEST
depends on SPI_MEM
help
This enables support for the Zynq Quad SPI controller
in master mode.

56
drivers/spi/spi.c
View File

@ -3317,33 +3317,52 @@ void spi_unregister_controller(struct spi_controller *ctlr)
}
EXPORT_SYMBOL_GPL(spi_unregister_controller);
static inline int __spi_check_suspended(const struct spi_controller *ctlr)
{
return ctlr->flags & SPI_CONTROLLER_SUSPENDED ? -ESHUTDOWN : 0;
}
static inline void __spi_mark_suspended(struct spi_controller *ctlr)
{
mutex_lock(&ctlr->bus_lock_mutex);
ctlr->flags |= SPI_CONTROLLER_SUSPENDED;
mutex_unlock(&ctlr->bus_lock_mutex);
}
static inline void __spi_mark_resumed(struct spi_controller *ctlr)
{
mutex_lock(&ctlr->bus_lock_mutex);
ctlr->flags &= ~SPI_CONTROLLER_SUSPENDED;
mutex_unlock(&ctlr->bus_lock_mutex);
}
int spi_controller_suspend(struct spi_controller *ctlr)
{
int ret;
int ret = 0;
/* Basically no-ops for non-queued controllers */
if (!ctlr->queued)
return 0;
ret = spi_stop_queue(ctlr);
if (ret)
dev_err(&ctlr->dev, "queue stop failed\n");
if (ctlr->queued) {
ret = spi_stop_queue(ctlr);
if (ret)
dev_err(&ctlr->dev, "queue stop failed\n");
}
__spi_mark_suspended(ctlr);
return ret;
}
EXPORT_SYMBOL_GPL(spi_controller_suspend);
int spi_controller_resume(struct spi_controller *ctlr)
{
int ret;
int ret = 0;
if (!ctlr->queued)
return 0;
ret = spi_start_queue(ctlr);
if (ret)
dev_err(&ctlr->dev, "queue restart failed\n");
__spi_mark_resumed(ctlr);
if (ctlr->queued) {
ret = spi_start_queue(ctlr);
if (ret)
dev_err(&ctlr->dev, "queue restart failed\n");
}
return ret;
}
EXPORT_SYMBOL_GPL(spi_controller_resume);
@ -4147,8 +4166,7 @@ static void __spi_transfer_message_noqueue(struct spi_controller *ctlr, struct s
ctlr->cur_msg = msg;
ret = __spi_pump_transfer_message(ctlr, msg, was_busy);
if (ret)
goto out;
dev_err(&ctlr->dev, "noqueue transfer failed\n");
ctlr->cur_msg = NULL;
ctlr->fallback = false;
@ -4164,7 +4182,6 @@ static void __spi_transfer_message_noqueue(struct spi_controller *ctlr, struct s
spi_idle_runtime_pm(ctlr);
}
out:
mutex_unlock(&ctlr->io_mutex);
}
@ -4187,6 +4204,11 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message)
int status;
struct spi_controller *ctlr = spi->controller;
if (__spi_check_suspended(ctlr)) {
dev_warn_once(&spi->dev, "Attempted to sync while suspend\n");
return -ESHUTDOWN;
}
status = __spi_validate(spi, message);
if (status != 0)
return status;

1
include/linux/spi/spi.h
View File

@ -566,6 +566,7 @@ struct spi_controller {
#define SPI_CONTROLLER_MUST_RX BIT(3) /* Requires rx */
#define SPI_CONTROLLER_MUST_TX BIT(4) /* Requires tx */
#define SPI_CONTROLLER_GPIO_SS BIT(5) /* GPIO CS must select slave */
#define SPI_CONTROLLER_SUSPENDED BIT(6) /* Currently suspended */
/* Flag indicating if the allocation of this struct is devres-managed */
bool devm_allocated;