Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756432AbZCDJSm (ORCPT ); Wed, 4 Mar 2009 04:18:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754386AbZCDJRQ (ORCPT ); Wed, 4 Mar 2009 04:17:16 -0500 Received: from mail-fx0-f176.google.com ([209.85.220.176]:47866 "EHLO mail-fx0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753780AbZCDJRG (ORCPT ); Wed, 4 Mar 2009 04:17:06 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=Dsifaz5VajwVnNf/lB4th7Fj4ItouWJK6JHJY39u5uk2crrnYpKxCyMunKMz4PKhcg 7CLpVwy+NMIxKRtvOtDuq14VtVJdJ5o9Xh/PbPi54EpiwnZXSXk+vtqeUZc9T66c/11x YimXE+kDXv4HNgl+YS4aB5EckfPvq2ZG0ZNxk= From: Borislav Petkov To: Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, Bartlomiej Zolnierkiewicz , Borislav Petkov Subject: [PATCH 1/3] ide-{floppy,tape}: fix padding for PIO transfers Date: Wed, 4 Mar 2009 10:16:54 +0100 Message-Id: <1236158216-23052-2-git-send-email-petkovbb@gmail.com> X-Mailer: git-send-email 1.6.1.3 In-Reply-To: <1236158216-23052-1-git-send-email-petkovbb@gmail.com> References: <1236158216-23052-1-git-send-email-petkovbb@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6557 Lines: 217 From: Bartlomiej Zolnierkiewicz * Return number of bytes left to transfer from idetape_{in,out}put_buffers() and number of bytes done from ide_tape_io_buffers(). * Fix padding for PIO transfers in ide_pc_intr() so read/write buffers are always completely processed and then the transfer is padded if necessary. * Remove invalid error messages. * Remove now superfluous padding from ide{_io_buffers,tape_input_buffers}(). While at it: * Set pc->bh to NULL in idetape_input_buffers() after all bh-s are done. * Cache !!(pc->flags & PC_FLAG_WRITING) in local variable in ide_pc_intr(). Cc: Borislav Petkov Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/ide-atapi.c | 57 +++++++++++++++------------------------------- drivers/ide/ide-tape.c | 32 +++++++++++++------------- 2 files changed, 35 insertions(+), 54 deletions(-) diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c index ff6adea..314e6af 100644 --- a/drivers/ide/ide-atapi.c +++ b/drivers/ide/ide-atapi.c @@ -108,13 +108,6 @@ int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, } } - if (bcount) { - printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name, - bcount, write ? "padding with zeros" - : "discarding data"); - ide_pad_transfer(drive, write, bcount); - } - return done; } EXPORT_SYMBOL_GPL(ide_io_buffers); @@ -316,9 +309,10 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive) struct request *rq = hwif->rq; const struct ide_tp_ops *tp_ops = hwif->tp_ops; xfer_func_t *xferfunc; - unsigned int timeout, temp; + unsigned int timeout, done; u16 bcount; u8 stat, ireason, dsc = 0; + u8 write = !!(pc->flags & PC_FLAG_WRITING); debug_log("Enter %s - interrupt handler\n", __func__); @@ -427,8 +421,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive) return ide_do_reset(drive); } - if (((ireason & ATAPI_IO) == ATAPI_IO) == - !!(pc->flags & PC_FLAG_WRITING)) { + if (((ireason & ATAPI_IO) == ATAPI_IO) == write) { /* Hopefully, we will never get here */ printk(KERN_ERR "%s: We wanted to %s, but the device wants us " "to %s!\n", drive->name, @@ -437,45 +430,33 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive) return ide_do_reset(drive); } - if (!(pc->flags & PC_FLAG_WRITING)) { - /* Reading - Check that we have enough space */ - temp = pc->xferred + bcount; - if (temp > pc->req_xfer) { - if (temp > pc->buf_size) { - printk(KERN_ERR "%s: The device wants to send " - "us more data than expected - " - "discarding data\n", - drive->name); - - ide_pad_transfer(drive, 0, bcount); - goto next_irq; - } - debug_log("The device wants to send us more data than " - "expected - allowing transfer\n"); - } - xferfunc = tp_ops->input_data; - } else - xferfunc = tp_ops->output_data; + xferfunc = write ? tp_ops->output_data : tp_ops->input_data; if ((drive->media == ide_floppy && !pc->buf) || (drive->media == ide_tape && pc->bh)) { - int done = drive->pc_io_buffers(drive, pc, bcount, - !!(pc->flags & PC_FLAG_WRITING)); + done = drive->pc_io_buffers(drive, pc, bcount, write); /* FIXME: don't do partial completions */ if (drive->media == ide_floppy) ide_complete_rq(drive, 0, done ? done : ide_rq_bytes(rq)); - } else - xferfunc(drive, NULL, pc->cur_pos, bcount); + } else { + done = min_t(unsigned int, bcount, pc->req_xfer - pc->xferred); + xferfunc(drive, NULL, pc->cur_pos, done); + } /* Update the current position */ - pc->xferred += bcount; - pc->cur_pos += bcount; + pc->xferred += done; + pc->cur_pos += done; + + bcount -= done; + + if (bcount) + ide_pad_transfer(drive, write, bcount); + + debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n", + rq->cmd[0], done, bcount); - debug_log("[cmd %x] transferred %d bytes on that intr.\n", - rq->cmd[0], bcount); -next_irq: /* And set the interrupt handler again */ ide_set_handler(drive, ide_pc_intr, timeout); return ide_started; diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c index 733cb51..12a6e5d 100644 --- a/drivers/ide/ide-tape.c +++ b/drivers/ide/ide-tape.c @@ -297,19 +297,15 @@ static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) return tape; } -static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, +static int idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, unsigned int bcount) { struct idetape_bh *bh = pc->bh; int count; while (bcount) { - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in " - "idetape_input_buffers\n"); - ide_pad_transfer(drive, 0, bcount); - return; - } + if (bh == NULL) + break; count = min( (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); @@ -323,21 +319,21 @@ static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, atomic_set(&bh->b_count, 0); } } + pc->bh = bh; + + return bcount; } -static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, +static int idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, unsigned int bcount) { struct idetape_bh *bh = pc->bh; int count; while (bcount) { - if (bh == NULL) { - printk(KERN_ERR "ide-tape: bh == NULL in %s\n", - __func__); - return; - } + if (bh == NULL) + break; count = min((unsigned int)pc->b_count, (unsigned int)bcount); drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); bcount -= count; @@ -352,6 +348,8 @@ static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, } } } + + return bcount; } static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) @@ -563,12 +561,14 @@ static void ide_tape_handle_dsc(ide_drive_t *drive) static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, unsigned int bcount, int write) { + unsigned int bleft; + if (write) - idetape_output_buffers(drive, pc, bcount); + bleft = idetape_output_buffers(drive, pc, bcount); else - idetape_input_buffers(drive, pc, bcount); + bleft = idetape_input_buffers(drive, pc, bcount); - return bcount; + return bcount - bleft; } /* -- 1.6.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/