drivers/bus/mhi/host/boot.c | 44 ++++++++++++++++++++------------- drivers/bus/mhi/host/init.c | 41 ++++++++++++++++++++++++++---- drivers/bus/mhi/host/internal.h | 2 ++ include/linux/mhi.h | 2 ++ 4 files changed, 67 insertions(+), 22 deletions(-)
When there is memory pressure during resume and no DMA memory is available, the ath11k driver fails to resume. The driver currently frees its DMA memory during suspend or hibernate, and attempts to re-allocate it during resume. However, if the DMA memory has been consumed by other software in the meantime, these allocations can fail, leading to critical failures in the WiFi driver. It has been reported [1]. Although I have recently fixed several instances [2] [3] to ensure DMA memory is not freed once allocated, we continue to receive reports of new failures. In this series, 3 more such cases are being fixed. There are still some cases which I'm trying to fix. They can be discussed separately. [1] https://lore.kernel.org/all/ead32f5b-730a-4b81-b38f-93d822f990c6@collabora.com [2] https://lore.kernel.org/all/20250428080242.466901-1-usama.anjum@collabora.com [3] https://lore.kernel.org/all/20250516184952.878726-1-usama.anjum@collabora.com Muhammad Usama Anjum (3): bus: mhi: host: keep bhi buffer through suspend cycle bus: mhi: host: keep bhie buffer through suspend cycle bus: mhi: keep device context through suspend cycles drivers/bus/mhi/host/boot.c | 44 ++++++++++++++++++++------------- drivers/bus/mhi/host/init.c | 41 ++++++++++++++++++++++++++---- drivers/bus/mhi/host/internal.h | 2 ++ include/linux/mhi.h | 2 ++ 4 files changed, 67 insertions(+), 22 deletions(-) -- 2.39.5
On 7/15/2025 9:25 PM, Muhammad Usama Anjum wrote: > When there is memory pressure during resume and no DMA memory is > available, the ath11k driver fails to resume. The driver currently > frees its DMA memory during suspend or hibernate, and attempts to > re-allocate it during resume. However, if the DMA memory has been > consumed by other software in the meantime, these allocations can > fail, leading to critical failures in the WiFi driver. It has been > reported [1]. > > Although I have recently fixed several instances [2] [3] to ensure > DMA memory is not freed once allocated, we continue to receive > reports of new failures. > > In this series, 3 more such cases are being fixed. There are still > some cases which I'm trying to fix. They can be discussed separately. > > [1] https://lore.kernel.org/all/ead32f5b-730a-4b81-b38f-93d822f990c6@collabora.com > [2] https://lore.kernel.org/all/20250428080242.466901-1-usama.anjum@collabora.com > [3] https://lore.kernel.org/all/20250516184952.878726-1-usama.anjum@collabora.com > > Muhammad Usama Anjum (3): > bus: mhi: host: keep bhi buffer through suspend cycle > bus: mhi: host: keep bhie buffer through suspend cycle > bus: mhi: keep device context through suspend cycles > > drivers/bus/mhi/host/boot.c | 44 ++++++++++++++++++++------------- > drivers/bus/mhi/host/init.c | 41 ++++++++++++++++++++++++++---- > drivers/bus/mhi/host/internal.h | 2 ++ > include/linux/mhi.h | 2 ++ > 4 files changed, 67 insertions(+), 22 deletions(-) > changelog missing
On 7/16/25 8:36 AM, Baochen Qiang wrote: > > > On 7/15/2025 9:25 PM, Muhammad Usama Anjum wrote: >> When there is memory pressure during resume and no DMA memory is >> available, the ath11k driver fails to resume. The driver currently >> frees its DMA memory during suspend or hibernate, and attempts to >> re-allocate it during resume. However, if the DMA memory has been >> consumed by other software in the meantime, these allocations can >> fail, leading to critical failures in the WiFi driver. It has been >> reported [1]. >> >> Although I have recently fixed several instances [2] [3] to ensure >> DMA memory is not freed once allocated, we continue to receive >> reports of new failures. >> >> In this series, 3 more such cases are being fixed. There are still >> some cases which I'm trying to fix. They can be discussed separately. >> >> [1] https://lore.kernel.org/all/ead32f5b-730a-4b81-b38f-93d822f990c6@collabora.com >> [2] https://lore.kernel.org/all/20250428080242.466901-1-usama.anjum@collabora.com >> [3] https://lore.kernel.org/all/20250516184952.878726-1-usama.anjum@collabora.com >> >> Muhammad Usama Anjum (3): >> bus: mhi: host: keep bhi buffer through suspend cycle >> bus: mhi: host: keep bhie buffer through suspend cycle >> bus: mhi: keep device context through suspend cycles >> >> drivers/bus/mhi/host/boot.c | 44 ++++++++++++++++++++------------- >> drivers/bus/mhi/host/init.c | 41 ++++++++++++++++++++++++++---- >> drivers/bus/mhi/host/internal.h | 2 ++ >> include/linux/mhi.h | 2 ++ >> 4 files changed, 67 insertions(+), 22 deletions(-) >> > > changelog missing Sorry, missed the changelog in the cover letter. For now, please find changelog in the individual patches. I'll add changelog if there would be v3. >
© 2016 - 2025 Red Hat, Inc.