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DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -3.50 X-Rspamd-Queue-Id: 5EA31224B1 Hi Am 12.08.24 um 08:42 schrieb Dan Carpenter: > This code has an issue because it loops until "i" is set to UINT_MAX but > the test for failure assumes that "i" is set to zero. The result is that > it will only print an error message if we succeed on the very last try. > Reformat the loop to count forwards instead of backwards. > > Fixes: 2281475168d2 ("drm/ast: astdp: Perform link training during atomic_enable") > Signed-off-by: Dan Carpenter > --- > v2: In version one, I introduced a bug where it would msleep(100) after failure > and that is a pointless thing to do. Also change the loop to a for loop. > --- > drivers/gpu/drm/ast/ast_dp.c | 12 +++++------- > 1 file changed, 5 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c > index 5d07678b502c..9bc21dd6a54d 100644 > --- a/drivers/gpu/drm/ast/ast_dp.c > +++ b/drivers/gpu/drm/ast/ast_dp.c > @@ -146,18 +146,16 @@ void ast_dp_power_on_off(struct drm_device *dev, bool on) > void ast_dp_link_training(struct ast_device *ast) > { > struct drm_device *dev = &ast->base; > - unsigned int i = 10; > + int i; > > - while (i--) { > + for (i = 0; i < 10; i++) { > u8 vgacrdc = ast_get_index_reg(ast, AST_IO_VGACRI, 0xdc); > > if (vgacrdc & AST_IO_VGACRDC_LINK_SUCCESS) > - break; > - if (i) > - msleep(100); > + return; > + msleep(100); But we don't want to wait during the final iteration of this loop. If you want to use the for loop, it should be something like for (i= 0; i < 10; ++i) {     if (i)       msleep(100)     // now test vgacrdc } Best regards Thomas > } > - if (!i) > - drm_err(dev, "Link training failed\n"); > + drm_err(dev, "Link training failed\n"); > } > > void ast_dp_set_on_off(struct drm_device *dev, bool on) -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)