[REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi_loader to hang
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From: Matthew Garrett on 16 Jan 2010 22:00 gobi_loader writes firmware to gobi USB devices (qcserial) via the USB serial layer by writing it a megabyte at a time (matching the Windows driver behaviour). Commit 8e8dce065088833fc418bfa5fbf035cb0726c04c breaks it - strace shows the write simply hanging. ssyrq-t says the backtrace is: Jan 17 15:37:37 localhost kernel: Call Trace: Jan 17 15:37:37 localhost kernel: [<ffffffff8128986c>] n_tty_write+0x2da/0x351 Jan 17 15:37:37 localhost kernel: [<ffffffff810464b4>] ? default_wake_function+0x0/0x14 Jan 17 15:37:37 localhost kernel: [<ffffffff81286969>] tty_write+0x19d/0x245 Jan 17 15:37:37 localhost kernel: [<ffffffff81289592>] ? n_tty_write+0x0/0x351 Jan 17 15:37:37 localhost kernel: [<ffffffff81103e44>] vfs_write+0xae/0x10b Jan 17 15:37:37 localhost kernel: [<ffffffff81103f61>] sys_write+0x4a/0x6e Jan 17 15:37:37 localhost kernel: [<ffffffff81009e45>] tracesys+0xd9/0xde The commit before this works fine. -- Matthew Garrett | mjg59(a)srcf.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |