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authorYicong Yang <yangyicong@hisilicon.com>2023-06-21 17:28:04 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-07-19 16:21:58 +0200
commitf7d56de13caa851291c0311e47a099873ca35268 (patch)
treea907693aadc63952b38db697419ee6a12bd63ad4 /lib/bitmap.c
parent34eef9e8c8e3b2c9c89835578209329091e17719 (diff)
hwtracing: hisi_ptt: Fix potential sleep in atomic context
[ Upstream commit 6c50384ef8b94a527445e3694ae6549e1f15d859 ] We're using pci_irq_vector() to obtain the interrupt number and then bind it to the CPU start perf under the protection of spinlock in pmu::start(). pci_irq_vector() might sleep since [1] because it will call msi_domain_get_virq() to get the MSI interrupt number and it needs to acquire dev->msi.data->mutex. Getting a mutex will sleep on contention. So use pci_irq_vector() in an atomic context is problematic. This patch cached the interrupt number in the probe() and uses the cached data instead to avoid potential sleep. [1] commit 82ff8e6b78fc ("PCI/MSI: Use msi_get_virq() in pci_get_vector()") Fixes: ff0de066b463 ("hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device") Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20230621092804.15120-6-yangyicong@huawei.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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