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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2d6f1da168
Before attempting to schedule a work-item onto hu->write_work in hci_uart_tx_wakeup(), check that the Data Link protocol layer is still bound to the HCI UART driver. Failure to perform this protocol check causes a race condition between the work queue hu->write_work running hci_uart_write_work() and the Data Link protocol layer being unbound (closed) in hci_uart_tty_close(). Note hci_uart_tty_close() does have a "cancel_work_sync(&hu->write_work)" but it is ineffective because it cannot prevent work-items being added to hu->write_work after cancel_work_sync() has run. Therefore, add a check for HCI_UART_PROTO_READY into hci_uart_tx_wakeup() which prevents scheduling of the work queue when HCI_UART_PROTO_READY is in the clear state. However, note a small race condition remains because the hci_uart_tx_wakeup() thread can run in parallel with the hci_uart_tty_close() thread so it is possible that a schedule of hu->write_work can occur when HCI_UART_PROTO_READY is cleared. A complete solution needs locking of the threads which is implemented in a future commit. Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> |
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| .. | ||
| ath3k.c | ||
| bcm203x.c | ||
| bfusb.c | ||
| bluecard_cs.c | ||
| bpa10x.c | ||
| bt3c_cs.c | ||
| btbcm.c | ||
| btbcm.h | ||
| btintel.c | ||
| btintel.h | ||
| btmrvl_debugfs.c | ||
| btmrvl_drv.h | ||
| btmrvl_main.c | ||
| btmrvl_sdio.c | ||
| btmrvl_sdio.h | ||
| btqca.c | ||
| btqca.h | ||
| btqcomsmd.c | ||
| btrtl.c | ||
| btrtl.h | ||
| btsdio.c | ||
| btuart_cs.c | ||
| btusb.c | ||
| btwilink.c | ||
| dtl1_cs.c | ||
| hci_ag6xx.c | ||
| hci_ath.c | ||
| hci_bcm.c | ||
| hci_bcsp.c | ||
| hci_h4.c | ||
| hci_h5.c | ||
| hci_intel.c | ||
| hci_ldisc.c | ||
| hci_ll.c | ||
| hci_mrvl.c | ||
| hci_nokia.c | ||
| hci_qca.c | ||
| hci_serdev.c | ||
| hci_uart.h | ||
| hci_vhci.c | ||
| Kconfig | ||
| Makefile | ||