| Message ID | 20201210194044.157283633@linutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | genirq: Treewide hunt for irq descriptor abuse and assorted fixes | expand |
On Thu, Dec 10, 2020 at 8:42 PM Thomas Gleixner <tglx@linutronix.de> wrote: > First of all drivers have absolutely no business to dig into the internals > of an irq descriptor. That's core code and subject to change. All of this > information is readily available to /proc/interrupts in a safe and race > free way. > > Remove the inspection code which is a blatant violation of subsystem > boundaries and racy against concurrent modifications of the interrupt > descriptor. > > Print the irq line instead so the information can be looked up in a sane > way in /proc/interrupts. > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > Cc: Linus Walleij <linus.walleij@linaro.org> > Cc: Lee Jones <lee.jones@linaro.org> > Cc: linux-arm-kernel@lists.infradead.org Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Yours, Linus Walleij
On Thu, 10 Dec 2020, Thomas Gleixner wrote: > First of all drivers have absolutely no business to dig into the internals > of an irq descriptor. That's core code and subject to change. All of this > information is readily available to /proc/interrupts in a safe and race > free way. > > Remove the inspection code which is a blatant violation of subsystem > boundaries and racy against concurrent modifications of the interrupt > descriptor. > > Print the irq line instead so the information can be looked up in a sane > way in /proc/interrupts. > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > Cc: Linus Walleij <linus.walleij@linaro.org> > Cc: Lee Jones <lee.jones@linaro.org> > Cc: linux-arm-kernel@lists.infradead.org > --- > drivers/mfd/ab8500-debugfs.c | 16 +++------------- > 1 file changed, 3 insertions(+), 13 deletions(-) Acked-by: Lee Jones <lee.jones@linaro.org>
On Thu, Dec 10, 2020 at 9:57 PM Thomas Gleixner <tglx@linutronix.de> wrote: > > First of all drivers have absolutely no business to dig into the internals > of an irq descriptor. That's core code and subject to change. All of this > information is readily available to /proc/interrupts in a safe and race > free way. > > Remove the inspection code which is a blatant violation of subsystem > boundaries and racy against concurrent modifications of the interrupt > descriptor. > > Print the irq line instead so the information can be looked up in a sane > way in /proc/interrupts. ... > - seq_printf(s, "%3i: %6i %4i", > + seq_printf(s, "%3i: %6i %4i %4i\n", Seems different specifiers, I think the intention was something like seq_printf(s, "%3i: %4i %6i %4i\n", > line, > + line + irq_first, > num_interrupts[line], > num_wake_interrupts[line]);
--- a/drivers/mfd/ab8500-debugfs.c +++ b/drivers/mfd/ab8500-debugfs.c @@ -1513,24 +1513,14 @@ static int ab8500_interrupts_show(struct { int line; - seq_puts(s, "name: number: number of: wake:\n"); + seq_puts(s, "name: number: irq: number of: wake:\n"); for (line = 0; line < num_interrupt_lines; line++) { - struct irq_desc *desc = irq_to_desc(line + irq_first); - - seq_printf(s, "%3i: %6i %4i", + seq_printf(s, "%3i: %6i %4i %4i\n", line, + line + irq_first, num_interrupts[line], num_wake_interrupts[line]); - - if (desc && desc->name) - seq_printf(s, "-%-8s", desc->name); - if (desc && desc->action) { - struct irqaction *action = desc->action; - - seq_printf(s, " %s", action->name); - while ((action = action->next) != NULL) - seq_printf(s, ", %s", action->name); } seq_putc(s, '\n'); }
First of all drivers have absolutely no business to dig into the internals of an irq descriptor. That's core code and subject to change. All of this information is readily available to /proc/interrupts in a safe and race free way. Remove the inspection code which is a blatant violation of subsystem boundaries and racy against concurrent modifications of the interrupt descriptor. Print the irq line instead so the information can be looked up in a sane way in /proc/interrupts. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Lee Jones <lee.jones@linaro.org> Cc: linux-arm-kernel@lists.infradead.org --- drivers/mfd/ab8500-debugfs.c | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-)