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Tasklets run with all the interrupts enabled. This means that we should replace all the (already present) spin_lock_irqsave() uses in the tasklet with spin_lock_irq() to protect being interrupted by a IRQ which tries to get the same lock (via calls to device_prep_dma_* for example). spin_lock and spin_lock_bh in tasklets are not enough to protect from IRQs, update these to spin_lock_irq(). at_xdmac_advance_work() can be called with all the interrupts enabled (when called from tasklet), or with interrupts disabled (when called from at_xdmac_issue_pending). Move the locking in the callers to be able to use spin_lock_irq() and spin_lock_irqsave() for these cases. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Link: https://lore.kernel.org/r/20200123140237.125799-10-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org> |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.