linux-kernel - Re: [PATCH] serial driver PMC MSP71xx, kernel linux-mips.git mast er

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <45D5E81B.7030304@ru.mvista.com>
Date:	Fri, 16 Feb 2007 20:21:31 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Marc St-Jean <Marc_St-Jean@...-sierra.com>
Cc:	Marc St-Jean <stjeanma@...-sierra.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH] serial driver PMC MSP71xx, kernel linux-mips.git mast
 er

Hello.

Marc St-Jean wrote:

>> > diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
>> > index 3d91bfc..bfaacc5 100644
>> > --- a/drivers/serial/8250.c
>> > +++ b/drivers/serial/8250.c
>> > @@ -308,6 +308,7 @@ static unsigned int serial_in(struct uar
>> >               return inb(up->port.iobase + 1);
>> > 
>> >       case UPIO_MEM:
>> > +     case UPIO_DWAPB:
>> >               return readb(up->port.membase + offset);
>> > 
>> >       case UPIO_MEM32:
>> > @@ -333,6 +334,8 @@ #endif
>> >  static void
>> >  serial_out(struct uart_8250_port *up, int offset, int value)
>> >  {
>> > +     /* Save the offset before it's remapped */
>> > +     int save_offset = offset;
>> >       offset = map_8250_out_reg(up, offset) << up->port.regshift;
>> > 
>> >       switch (up->port.iotype) {

>>    I've just got an idea how to "beautify" this code -- rename the 
>>'offset'
>>arg to something like reg, and then declare/init 'offset' as local 
>>variable.
>>Would certainly look better (and worth doing in all serial_* accessros).

> I agree but am having enough of a hard time getting the bare minimum
> accepted that I don't dare touch any unnecessary lines.

    Well, I can try pushing this simple cleanup myself... seems worth doing 
for alike future cases anyway.

>> > @@ -359,6 +362,18 @@ #endif
>> >                       writeb(value, up->port.membase + offset);
>> >               break;
>> > 
>> > +     case UPIO_DWAPB:
>> > +             /* Save the LCR value so it can be re-written when a
>> > +              * Busy Detect interrupt occurs. */
>> > +             if (save_offset == UART_LCR)
>> > +                     up->lcr = value;
>> > +             writeb(value, up->port.membase + offset);
>> > +             /* Read the IER to ensure any interrupt is cleared before
>> > +              * returning from ISR. */
>> > +             if (save_offset == UART_TX || save_offset == UART_IER)
>> > +                     value = serial_in(up, UART_IER);
>> > +             break;
>> > +            
>> >       default:
>> >               outb(value, up->port.iobase + offset);
>> >       }
>> > @@ -2454,8 +2485,8 @@ int __init serial8250_start_console(stru
>> > 
>> >       add_preferred_console("ttyS", line, options);
>> >       printk("Adding console on ttyS%d at %s 0x%lx (options '%s')\n",
>> > -             line, port->iotype == UPIO_MEM ? "MMIO" : "I/O port",
>> > -             port->iotype == UPIO_MEM ? (unsigned long) port->mapbase :
>> > +             line, port->iotype >= UPIO_MEM ? "MMIO" : "I/O port",
>> > +             port->iotype >= UPIO_MEM ? (unsigned long) port->mapbase :
>> >                   (unsigned long) port->iobase, options);
>> >       if (!(serial8250_console.flags & CON_ENABLED)) {
>> >               serial8250_console.flags &= ~CON_PRINTBUFFER;

>>    I've remembered why I decided not to fix it: this code only gets called
>>from 8250__eraly.c which can't handle anything beyond UPIO_MEM anyway.

> We don't use 8250_early and I've tested it works without, so I'll drop this
> change.

    No need I guess since this is the Right Thing (TM) anyway.

> Thanks,
> Marc

WBR, Sergei
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/